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Retirement Plans - Schedule of Fair Value of Plan Assets for Pension Plans with a PBO or ABO in Excess of Plan Assets (Details) - Pension Plans [Member] - USD ($)
$ in Millions
May 31, 2018
May 31, 2017
U.S. Plans [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 22,057 $ 24,933
PBO (22,653) (27,870)
Net funded status (596) (2,937)
ABO [1] (1,134) (27,244)
Fair value of plan assets 859 24,933
PBO (1,214) (27,870)
Net funded status (355) (2,937)
International Plans [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 1,060 952
PBO (1,791) (1,656)
Net funded status (731) (704)
ABO [1] (1,581) (1,433)
Fair value of plan assets 1,060 928
PBO (1,791) (1,626)
Net funded status $ (731) $ (698)
[1] ABO not used in determination of funded status.